250 million years ago is the Permian extinction.

二叠纪大灭绝发生在2.5亿年前。

Presto! The Permian mass extinction is explained.

就这样！这就是二叠纪物种大灭绝的解释。

The bear case rests on patience, a Persian restoration and a Permian boom.

看跌的理由在于耐心，波斯的恢复和二叠纪的繁荣。

It happens at the end of the Permian period about 250 million years ago.

它发生在大约 2.5 亿年前的二叠纪末。

The idea that an impact caused the Permian extinction has been around for a while.

导致二叠纪大灭绝的原因长都没有一个定论。

The researchers said they see similarities between the Permian mass extinction and today's climate change problem.

研究人员说，们看到了二叠纪集群绝灭和如今气候变化间的相似处。

At the end of the Permian, the extinction figure was more than 80%.

在二叠纪末，那场大灭绝带走了超过80%的物种。

The synapsids divided into four streams, only one of which survived beyond the Permian.

下孔亚纲分成四支，只有一支闯过了二叠纪。

The Permian event was particularly devastating to sea creatures.

二叠纪事件对海洋动物的破坏性尤其严重。

Here in the Permian, we also start to see the first evidence of walking on two legs.

在二叠纪时，我们也第一次发现了有些动物开始靠两条腿行走的证据。

And then all eyes began once again turning back towards the gigantic Permian Basin over in west Texas.

然后，所有的目光又开始转向德克萨斯州西部巨大的二叠纪盆地。

The acquisition expands Chevron's shale-oil assets in America's Permian basin, where Anadarko is a leading independent operator.

此次收购扩大了雪佛龙在美国二叠纪盆地的页岩油资产，阿纳达科是该地区领先的独立运营商。

It followed after Earth's worst mass extinction 252 million years ago at the end of the Permian Period.

在2.52亿年前地球上最严重的大灭绝后，紧随着就是二叠纪末。

The event took place at the end of what Earth scientists, or geologists, call the Permian Period.

这一事件发生在地球科学家或地质学家所说的二叠纪末。

But then by the end of the Permian period, their immense run across deep time is over and they go extinct.

但到了二叠纪末，它们在漫长的地质时间中的辉煌历程结束了，最终灭绝。

And for the first time since the Permian extinction...

自从二叠纪灭绝。

In the four million years since the Permian extinction...

{\an8}（2.48亿年前）二叠纪灭绝后的400万年中。

Now, dinosaurs did exist in this dry, post-Permian world.

现在，恐龙确实存在于这个干燥的后二叠纪 世界。

In the Permian, at least 95 percent of animals known from the fossil record check out, never to return.

在二叠纪，至少95%从化石记录中得知的动物退了场，再也没有回。

We think something similar was the cause of the end-Permian extinction.

我们认为类似的事情是二叠纪末灭绝的原因。